Slate is formed when fine-grained sedimentary rock (shale) is buried and exposed to high pressure deep beneath the Earth’s surface. Slate cleaves, or splits, readily into thin slabs having great tensile strength and durability.
Slate may be black, blue, purple, red, green, or grey. Dark slates usually owe their colour to carbonaceous material. Reddish and purple varieties owe their colour to the presence of iron oxide. Slate can be used for paving, stepping stones in gardens, wall cladding and roofing.
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